During a exhausting 100-mile ultramarathon race in the dense rainforest of Oahu, Hawaii, runner Kay Borleis encountered a mysterious figure unbeknownst to her during the event. Borleis had to withdraw from the race due to a foot injury. After sharing race photos, a friend noticed an unusual figure in one picture that neither Borleis nor her pacing partner had seen during the race. Investigation led to the discovery of a local legend about 'Nightmarchers,' deceased Hawaiian warriors believed to haunt the rainforest, further adding to the mystery.